Index: config.mk
--- config.mk.orig
+++ config.mk
@@ -4,8 +4,8 @@ VERSION = 2.1
 # Customize below to fit your system
 
 # paths
-PREFIX = /usr/local
-MANPREFIX = $(PREFIX)/share/man
+PREFIX ?= /usr/local
+MANPREFIX ?= $(PREFIX)/man
 LIBPREFIX = $(PREFIX)/lib
 LIBDIR = $(LIBPREFIX)/surf